--  @testpoint:opengauss关键字range(非保留)，作为函数名

--关键字不带引号-成功
drop function if exists range;
create function range(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function range;
--关键字带双引号-成功
drop function if exists "range";
create function "range"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function "range";
--关键字带单引号-合理报错
drop function if exists 'range';
create function 'range'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `range`;
create function `range`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/